(320+50)-(60+70)=500
320+50=370
60+70=130
1. 320 + 50 = 370
2. 60 + 70 = 130
3. 370 - 130 = 240
( 320 + 50) - ( 60 + 70) = 370 - 130 = 240
(320+50)-(60+70)=500
320+50=370
60+70=130
1. 320 + 50 = 370
2. 60 + 70 = 130
3. 370 - 130 = 240
( 320 + 50) - ( 60 + 70) = 370 - 130 = 240